Tiny discs can levitate in the upper atmosphere using sunlight alone

An illustration of solar-powered levitating discs Schafer et al. Nature Fingernail-size discs that levitate in sunlight could someday carry sensors through some of the thinnest and coldest reaches of the atmosphere. By flying higher than commercial aircraft or weather balloons can, such swarms could reveal new insights about Earth’s changing weather and climate patterns. The…

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How the World Flows: This book could convince you to become an engineer

Microfluidics makes it possible for devices like this chip to simulate biological organs WLADIMIR BULGAR/SCIENCE PHOTO LIBRARY How the World Flows(Albert Folch, Oxford University Press, on sale now) What do rainbows, inkjet printers, human skin, pregnancy tests and fish gills have in common? To answer this question, we must travel to what Albert Folch, a bioengineering…

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Cancer-killing virus becomes more effective when shielded by bacteria

The herpes virus can help treat severe skin cancer Science Photo Library/Alamy Viruses have shown huge potential in treating various kinds of cancer, but the immune response has limited their application to tumours near the body’s surface. Now, scientists have demonstrated that shielding viruses with genetically engineered bacteria bypasses this issue, slowing the growth of…

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